<?php
/*
* Captcha Class base on PHP GD Lib
* @author Design
* @version 1.0
* @copyright js8.in 2010
* @demo
* include('captchaClass.php');
* $captchaDemo=new Captcha();
* $captchaDemo->createImage();
*/
class Captcha{
//@定义验证码图片高度
    private $height;
//@定义验证码图片宽度
    private $width;
//@定义验证码字符个数
    private $textNum;
//@定义验证码字符内容
    private $textContent;
//@定义字符颜色
    private $fontColor;
//@定义随机出的文字颜色
    private $randFontColor;
//@定义字体大小
    private $fontSize;
//@定义字体
    private $fontFamily;
//@定义背景颜色
    private $bgColor;
//@定义随机出的背景颜色
    private $randBgColor;
//@定义字符语言
    private $textLang;
//@定义干扰点数量
    private $noisePoint;
//@定义干扰线数量
    private $noiseLine;
//@定义是否扭曲
    private $distortion;
//@定义扭曲图片源
    private $distortionImage;
//@定义是否有边框
    private $showBorder;
//@定义验证码图片源
    private $image;

//@Constructor 构造函数
    public function Captcha(){
        $this->textNum=4;
        $this->fontSize=16;
        $this->fontFamily='c:\\windows\\fonts\SIMYOU.ttf';//设置中文字体，可以改成linux的目录
        $this->textLang='en';
        $this->noisePoint=30;
        $this->noiseLine=3;
        $this->distortion=false;
        $this->showBorder=false;
    } // from liehuo.net

//@设置图片宽度
    public function setWidth($w){
        $this->width=$w;
    }

//@设置图片高度
    public function setHeight($h){
        $this->height=$h;
    }

//@设置字符个数
    public function setTextNumber($textN){
        $this->textNum=$textN;
    }

//@设置字符颜色
    public function setFontColor($fc){
        $this->fontColor=sscanf($fc,'#%2x%2x%2x');
    }

//@设置字号
    public function setFontSize($n){
        $this->fontSize=$n;
    }

//@设置字体
    public function setFontFamily($ffUrl){
        $this->fontFamily=$ffUrl;
    }

//@设置字符语言
    public function setTextLang($lang){
        $this->textLang=$lang;
    }

//@设置图片背景
    public function setBgColor($bc){
        $this->bgColor=sscanf($bc,'#%2x%2x%2x');
    }

//@设置干扰点数量
    public function setNoisePoint($n){
        $this->noisePoint=$n;
    }

//@设置干扰线数量
    public function setNoiseLine($n){
        $this->noiseLine=$n;
    }

//@设置是否扭曲
    public function setDistortion($b){
        $this->distortion=$b;
    }

//@设置是否显示边框
    public function setShowBorder($border){
        $this->showBorder=$border;
    }

//@初始化验证码图片
    public function initImage(){
        if(empty($this->width)){$this->width=floor($this->fontSize*1.3)*$this->textNum+10;}
        if(empty($this->height)){$this->height=$this->fontSize*2;}
        $this->image=imagecreatetruecolor($this->width,$this->height);
        if(empty($this->bgColor)){
            $this->randBgColor=imagecolorallocate($this->image,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));
        }else{
            $this->randBgColor=imagecolorallocate($this->image,$this->bgColor[0],$this->bgColor[1],$this->bgColor[2]);
        }
        imagefill($this->image,0,0,$this->randBgColor);
    }

//@产生随机字符
    public function randText($type){
        $string='';
        switch($type){
            case 'en':
                $str='0123456789';
                for($i=0;$i<$this->textNum;$i++){
                    $string=$string.','.$str[mt_rand(0,29)];
                }
                break;
            case 'cn':
                for($i=0;$i<$this->textNum;$i++) {
                    $string=$string.','.chr(rand(0xB0,0xCC)).chr(rand(0xA1,0xBB));
                }
                $string=iconv('GB2312','UTF-8',$string); //转换编码到utf8
                break;
        }
        //return substr($string,1);
        return rand(1000,9999);
    }

//@输出文字到验证码
    public function createText(){
        $textArray=explode(',',$this->randText($this->textLang));
        $this->textContent=join('',$textArray);
        if(empty($this->fontColor)){
            $this->randFontColor=imagecolorallocate($this->image,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));
        }else{
            $this->randFontColor=imagecolorallocate($this->image,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
        }
        for($i=0;$i<$this->textNum;$i++){
            $angle=mt_rand(-1,1)*mt_rand(1,20);
            imagettftext($this->image,$this->fontSize,$angle,5+$i*floor($this->fontSize*1.3),floor($this->height*0.75),$this->randFontColor,$this->fontFamily,$textArray[$i]);
        }
    }

//@生成干扰点
    public function createNoisePoint(){
        for($i=0;$i<$this->noisePoint;$i++){
            $pointColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
            imagesetpixel($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),$pointColor);
        }

    }

//@产生干扰线
    public function createNoiseLine(){
        for($i=0;$i<$this->noiseLine;$i++) {
            $lineColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),20);
            imageline($this->image,0,mt_rand(0,$this->width),$this->width,mt_rand(0,$this->height),$lineColor);
        }
    }

//@扭曲文字
    public function distortionText(){
        $this->distortionImage=imagecreatetruecolor($this->width,$this->height);
        imagefill($this->distortionImage,0,0,$this->randBgColor);
        for($x=0;$x<$this->width;$x++){
            for($y=0;$y<$this->height;$y++){
                $rgbColor=imagecolorat($this->image,$x,$y);
                imagesetpixel($this->distortionImage,(int)($x+sin($y/$this->height*2*M_PI-M_PI*0.5)*3),$y,$rgbColor);
            }
        }
        $this->image=$this->distortionImage;
    }

//@生成验证码图片
    public function createImage(){
        $this->initImage(); //创建基本图片
        $this->createText(); //输出验证码字符
     //   if($this->distortion){$this->distortionText();} //扭曲文字
     //   $this->createNoisePoint(); //产生干扰点
     //   $this->createNoiseLine(); //产生干扰线
        if($this->showBorder){imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$this->randFontColor);} //添加边框
        imagepng($this->image);
        imagedestroy($this->image);
        if($this->distortion){imagedestroy($this->$distortionImage);}
        return $this->textContent;
    }

}
?>